Issue 26249. Quick Assist to convert getters into final fields.

pkg/analysis_server/lib/src/services/correction/assist.dart

Index: pkg/analysis_server/lib/src/services/correction/assist.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/assist.dart b/pkg/analysis_server/lib/src/services/correction/assist.dart
index 2024b75842619cc646bce24e44085232c24f96e7..6ec7a089d4a45d901f380bbd230cc373ba41d7c5 100644
--- a/pkg/analysis_server/lib/src/services/correction/assist.dart
+++ b/pkg/analysis_server/lib/src/services/correction/assist.dart
@@ -89,6 +89,8 @@ class DartAssistKind {
       'CONVERT_INTO_EXPRESSION_BODY', 30, "Convert into expression body");
   static const CONVERT_INTO_FOR_INDEX = const AssistKind(
       'CONVERT_INTO_FOR_INDEX', 30, "Convert into for-index loop");
+  static const CONVERT_INTO_FINAL_FIELD = const AssistKind(
+      'CONVERT_INTO_FINAL_FIELD', 30, "Convert into final field");
   static const CONVERT_INTO_IS_NOT =
       const AssistKind('CONVERT_INTO_IS_NOT', 30, "Convert into is!");
   static const CONVERT_INTO_IS_NOT_EMPTY = const AssistKind(